Boiling Coolant reserve tank

Discussion in 'FJ55 Iron Pig Preservation Society' started by flaa1a, Jul 27, 2009.

  1. flaa1a

    flaa1a SILVER Star

    Messages:
    1,365
    Location:
    Wichita
    After driving my 1972 55 for about 20 or more minutes and shuting it off, the coolant in the Reserve Tank is boiling furiously! The radiator cap from the PO was shot so I bought one at Autozone...it did not seal good, so I got an OEM one from the Toyota dealership here in town. It seems to seal a little better. The PO said he changed the water pump, but not the thermostat. I changed the thermostat last week (broke the bolts off while taking it off...probabaly why the PO did not change it). Does anyone have any experiences with this? The reserve tank is prolly not an original, and i have had to add Coolant a couple of times because it get so hot it blows stuff out the overfill hose. maybe I just have over filled it? I have visions of the two rear heater hoses blowing up and spewing hot molten lava all over me and my son.

    FLA A1A
  2. Check the compression or do a leak down test. Sounds to me like a head gasket. What does the temp gauge show when this is going on?
  3. flaa1a

    flaa1a SILVER Star

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    1,365
    Location:
    Wichita
    It stays within the two white lines....a little closer to the top end though.
  4. Yep, check compression and do a leak down test then. My bet is a head gasket gone bad.
  5. flaa1a

    flaa1a SILVER Star

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    1,365
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    Is that a pricey repair? I know......:eek:
  6. Not necessarily but it's not a $20 repair either.
  7. the price of the repair would really depend if you do it or not, parts are cheap labor for this is not.
  8. fjdaveinoz

    fjdaveinoz

    Messages:
    271
    Location:
    Yass, NSW Australia
    This may be left field, but I had a similar problem - radiator pushing boiling water into overflow tank, and couldnt track it down. Replaced everything inc radiator to no avail. Someone suggested ignition timing. Checked and it was out, not a lot, car was running ok. Adjusted timing, car ran a lot better, way cooler, and never boiled again. Hope this works for you, beats doing a HG. Have you checked to see if there are heaps of bubbles in radaitor with cap off and car running?


    Dave
  9. flaa1a

    flaa1a SILVER Star

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    No I have not yet... I am going to check the compression and the timing and I will let everyone know....Thanks for the help everybody!
  10. flaa1a

    flaa1a SILVER Star

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    1,365
    Location:
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    What would the bubbles in the radiator while the pig is running imply?
  11. Ming89FJ62

    Ming89FJ62 SILVER Star

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    Could be as simple as some air trapped in the cooling system but more than likely than not a blown head gasket or cracked head. It really all depends...

  12. PabloCruise

    PabloCruise SILVER Star

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    Does coolant smell like gas?

    Is there coolant in the oil (oil look milky)?

    Does exhaust smell like coolant?

    These would all be subtle clues that the head gasket has indeed been comprimised.

    If it is headgasket, this is a reasonable repair for you to accomplish. THe good news is that it is a great time to send out the head for a valve job.
  13. flaa1a

    flaa1a SILVER Star

    Messages:
    1,365
    Location:
    Wichita
    No oil in the radiator, no water in the oil either. Both look fine. A buddy told us to check the spark plugs for white discoloration as this is an indication of a blown head gasket. Unfortunatley the PO changed the plugs not too long ago. One did seem a little white, but not too bad. On one hand I want to change the HG just so I can clean everything up. On the other hand, I will be pissed if I change it and spend all the time on it and it still boils!!:bang:
  14. A leak down test should be fairly conclusive. Do that first and report back. You can have a cracked head or blown head gasket without getting coolant in the oil or oil in the coolant. White plugs would be a tell tale but if they are new...
  15. fjdaveinoz

    fjdaveinoz

    Messages:
    271
    Location:
    Yass, NSW Australia
    Do all the simple stuff first
    Flush cooling system inc heater
    Pull radiator, flush it
    back flush everything again and fill with good anti freeze anti boil coolant (can you get castrol stuff there? they do an excellent one which is well priced)
    check plugs are correct ones
    set points etc, new rotor arms, points and dissy caps are cheap, just replace them if they are even slightly questionable.
    reset timing and tune to the grade of fuel you are using.
    go for a drive and hope it dont boil again

    on a side note, It's not as common for a landcruiser to do a HG here in oz, I have worked for a toyota dealer for years and have rarely done one even on an 80 series. I see its a common problem over there. My 80 is running on LPG (propane) for the last 340,000 klms and has never had the head off. I have done quite a few 3F's never a 2F, unless part of a rebuild, or a burnt valve (very common here - esp 3f's) and they have all been abused and have high milage. I wonder what makes our hg's better down here? surely they were the same world wide.


    Dave
  16. southerncruiser62

    southerncruiser62

    Messages:
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    Location:
    Charleston
    Just went through all of this and concluded head gasket, all the symptons you mentioned.

    Not a bad job just time consuming slightly, but take your time.
  17. PabloCruise

    PabloCruise SILVER Star

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    12,232
    Location:
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    But does coolant smell like gasoline?

    Do a compression check, and/or leak-down test.

    Let us know.
  18. flaa1a

    flaa1a SILVER Star

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    I can get a compression checker thing...and my dad has a timing light......but I am embarrassed to say I do not know what a "leak down" test is. Can I get a quick run down....
  19. Ming89FJ62

    Ming89FJ62 SILVER Star

    Messages:
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    Location:
    Palatine, IL
    Don't be embarassed. Here's link w/ a good description
    What is a "leak down" test? — Yahoo! Autos
  20. southerncruiser62

    southerncruiser62

    Messages:
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    Location:
    Charleston

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